That is pretty outdated, and that was the only thing I did where I told most of my contacts, so they could Identify me to see who I am.
For example, lets say, my name is like it is right now (Maxx) and I change it to something else, for example like, BigProductions (my youtube channel is thebigmaxx and I use it for gaming and stuff), so I send a message to my contacts saying that I changed my name, so I'm not up at three in the morning having this:
Guy 1: who are you and how did you get into my contacts lol
Guy 2: (me) I changed my name from (insert last name here) to (changed name here)
Guy 1: ohhh
And that would probably repeat for like the whole night, and it would be a pain in the ass to explain since I don't just explain things 24/7.